Merge branch 'ab/reflog-parse-options'

Merge branch 'ab/reflog-parse-options'

"git reflog" command now uses parse-options API to parse its
command line options.

* ab/reflog-parse-options:
  reflog: fix 'show' subcommand's argv
  reflog [show]: display sensible -h output
  reflog: convert to parse_options() API
  reflog exists: use parse_options() API
  git reflog [expire|delete]: make -h output consistent with SYNOPSIS
  reflog: move "usage" variables and use macros
  reflog tests: add missing "git reflog exists" tests
  reflog: refactor cmd_reflog() to "if" branches
  reflog.c: indent argument lists